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Finding the Fourth Proportional to 3,720.82, 5,582.16 and 1,123.78

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Solution

The fourth proportional to 3,720.82, 5,582.16 and 1,123.78 is: 1,685.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,720.82 : 5,582.16 = 1,123.78 : x
  2. Step 2: Convert to fraction form
    3,720.82/5,582.16 = 1,123.78/x
  3. Step 3: Cross multiply
    3,720.82x = 5,582.16 × 1,123.78
  4. Step 4: Simplify right side
    3,720.82x = 6,273,119.76
  5. Step 5: Solve for x
    x = 6,273,119.76/3,720.82
  6. Step 6: Final answer
    x = 1,685.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.